As discussed on IRC, gdb can crash on the following sequence:

gdb <really big program>
b <tab><tab>
[ctrl-c before tab-completion is done]
b <tab>
(segmentation fault)

The problem comes because the dwarf2read.c tries to discover the full
linkage name of symbols, and assumes that it won't be interrupted.
But the *_type_print* and *_print_type* functions do contain calls to
QUIT.

I'm sure it also occurs at times other than tab-completion--any time a
psymtab being converted to a symtab is interrupted.

This patch adjusts the functions in question to conditionally call
quit based on the variable show, which is -1 when they are called to
discover the full linkage name--among other times.

Sterling

2011-06-10  Sterling Augustine  <saugustine@google.com>

	* typeprint.h (TYPE_PRINT_QUIT): New macro.
	* psymtab.c (map_symbol_filenames_psymtab): Call QUIT.
	* p-typeprint.c (pascal_type_print_varspec_prefix): Call
	TYPE_PRINT_QUIT instead of QUIT.
	(pascal_type_print_varspec_suffix): Likewise.
	(pascal_type_print_base): Likewise.
	* m2-typeprint.c (m2_print_type): Likewise.
	* jv-typeprint.c (java_type_print_base): Likewise.
	* f-typeprint.c: Include typeprint.h.
	(f_type_print_varspec_prefix): Call
	TYPE_PRINT_QUIT instead of QUIT.
	(f_type_print_varspec_suffix): Likewise.
	(f_type_print_base): Likewise.
	* c-typeprint.c (c_type_print_varspec_prefix): Likewise.
	(c_type_print_varspec_suffix): Likewise.
	(c_type_print_base): Likewise. Remove extraneous calls to QUIT.
	* ada-typeprint.c (print_enum_type): Add show parameter. Call
	TYPE_PRINT_QUIT.
	(ada_print_type): Likewise.